Carnitine and acetyl L carnitine Neuroneeds L Carnitine vs L Arginine: Understanding Their Differences and Benefit Fitness Health What is carnitine? Carnitine is produced in the body from the amino acid lysine and naturally occurs in some foods. It supports energy metabolism and muscle function, which are important factors in How Much Carnitine? Book Excerpt of the Week GEG Research and Consulting Is L Carnitine safe for athletes at doses up to 6000 mg day? Consensus